Cellulose acetate compositions



2,047,919 CELLULOSE ACETATE COMPOSITIONS Paul La Frone Magill,

signor to E. I. du Pont Ina, Wilmington, Del ware No Drawing. Application No Serial No.

3 Claims. (Cl. 106-40) etate soluparticularly to a solvent and for cellulose acetate composi- This invention relates to cellulose ac tions and more blending agent tions.

Known procedures for dissolving cellulose acetate include the use of such materials as aliphatic ketones and esters and/or various of the chlorinated hydrocarbons as solvents. Such solvents do not, as a rule, dissolve other oxygenated chemical substances occurring widely in nature and difiering markedly in type and structure from cellulose acetate. i An object of this invention is to provide a solvent for cellulose acetate which readily dissolves at the same time many other types of organic materials. Other objects will appear hereinafter. These objects are accomplished by using formamide alone or combined with other materials as a solvent. This use of formamide is illustrated by the following examples:

' Example 1 Example 2 m Twelve grams 01 formamide and 1.5 grams of cellulose acetate were mixed cold and warmed to bring about solution. 6.25 grams of casein were Niagara Falls, N. Y., as-

de Nemours & Company, a corporation of Delavember 16, 1934, 753,371

dissolved in cc. of formamide and the casein solution mixed at 100 C. with the cellulose acetate solution. A clear, viscous solution resulted.

Example 3' i 370 grams of formamide, 15 grams of cellulose acetate, 62.5 grams of casein and 100 cc. of methanol .were mixed and brought to a uniform solution by heating. 20.5 grams of this solution were mixed with 5 grams of lampblack. The resulting product when cooled was a smooth, intensely black, viscous mass.

Various modifications in the properties of the formamide-cellulose acetate solutions may be effected by incorporating therein additional mate- 5 rials soluble in formamide such as starch, dyes, glue, gelatine, dextrin and albumin and/or other materials, e. g., oils and waxes.

These compositions have valuable properties for such uses as textile coatings and impregnat- 20 ing media, leather dressings, printing inks, paints, adhesives, plastics and many other uses.

Claims:

1. A composition 'of matter comprising cellulose acetate, formamide and casein. 25 2. A composition of matter comprising cellulose acetate, formamide, casein and a pigment.

3. A composition of matter comprising cellulose acetate, formamide, casein, methanol and a pigment.

- PAUL LA FRONE MAGILL. 

